The dohyō (土俵) is the ring in which
sumo wrestling bouts are held. A modern dohyo is a circle of rice-straw bales 4.55 meters in diameter, mounted on a square platform of
clay 6.7m on a side, and 34 to 60 cm high. The surface is covered by
sand.A new dohyō is built prior to each tournament by the
yobidashi, who are responsible for this activity. The dohyō is removed after each tournament, and in the case of Nagoya, pieces are taken home by the fans as souvenirs. The yobidashi also build the dohyō for training stables and sumo touring events. The diameter of the ring is 15
shaku (4.55 meters), which increased from 13 shaku (3.94 meters) in 1931. The rice-straw bales (tawara (俵)) which form the ring are one third standard size and are partially buried in the clay of the dohyō. Four of the tawara are placed slightly outside the line of the circle. In olden times this was to allow rain to run off the surface, when sumo tournaments were held outdoors in the open. Today a wrestler under pressure at the edge of the ring will often try to move himself round to one of these points to gain leverage in order to push back more effectively against the opponent who is trying to force him out.
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A dohjó (土俵, Hepburn-átírással dohyō) a
szumómérkőzések színtere, amelynek közepén egy 4,55 méter nagyságú, agyagból és szalmából készült kör alakú küzdőtér található. A jelenlegi méretekre vontkozó szabályokat 1931-ben fogadták el.
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